I ran this kernel yesterday and everything went well, but I got this ‘content disposition’ error today. I really do not know to handle this, it would great if you can give me a hand.
The loaded dataset expaects a key called content-disposition at one point.
I’m not familiar with the dataset, but would recommend to check, if the data itself was somehow changed, moved etc.
Crying 
I meet the same problem today, and use the same dataset AGNews.